Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Chamber enclosing work during bonding and/or assembly
Patent
1988-05-31
1993-07-06
Simmons, David A.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Chamber enclosing work during bonding and/or assembly
156285, 156475, 1565833, 264511, B32B 3100
Patent
active
052250270
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the plastics coating of three-dimensional solids, in which a plastics sheet is laid onto a solid and pressed against it with the aid of a pressure cushion, with heating. Moreover, the invention relates to an apparatus for the implementation of this process.
Instead of some other surface treatment of a solid, for example a furniture component, it is frequently easier to coat the solid with a plastics sheet. This applies, for example, to chipboards in the furniture industry for the production of the individual components, in particular doors and front panels of closet furniture. Chipboards were initially coated with plastic overall on both sides and subsequently cut to size to form individual furniture components, the peripheral borders of which were then masked with the aid of so-called edge bands. In the case of furniture components in board form with sufficiently rounded-off corners and edges, under certain preconditions there is the possibility of simultaneously coating with a continuous plastics sheet for instance the front surface and two mutually opposite borders, as is specified for example in German Utility Model 8,631,961, in which there are no indications, however, of the coating process to be used. Veneers are applied in this way with the aid of pressure cushion presses, so-called membrane presses.
However, thus far there has not been any satisfactory success in simultaneously coating with continuous plastics sheet the entire peripheral borders of a board together with one main surface. This is due to the fact that an excess of material occurs in the plastics sheet at the corners or curves of the outer contour, which leads to the formation of folds and at the same time an inadequate adhesion of the plastics sheet. This can be remedied to a certain extent by cutting into the plastics sheet in the corner regions and fixing with overlap, but the cut lines generally remain visible in a disturbing way.
When coating solids with the aid of plastics sheets, apart from the use of a suitable adhesive, a heating of the plastics sheet is necessary. Membrane presses make such a heating possible by virtue of the fact that heat radiators or other suitable heating devices are arranged in the pressure space behind the membrane, so that, when it comes into contact with the membrane, the sheet is heated through the membrane. However, depending on the type of sheet used, this may result in it adhering to the membrane so strongly that, when the membrane is raised after the coating operation, it is again taken along by the membrane. This of course leads to considerable operating delays and costs. Further difficulties may arise in practice as a result of air pockets occurring when the membrane is laid onto the plastics sheet, in the region of which pockets the membrane cannot act with the necessary pressure on the plastics sheet.
The invention is based on the object of creating an apparatus of the type mentioned at the beginning which allows the three-dimensional solid, in particular a solid in board form, to be coated in one operation with a continuous plastics sheet on a main surface and the entire peripheral border with a plastics sheet without the formation of folds in the corners in a manner free from operational disruptions.
This object is achieved according to the invention in the case of a process of the type mentioned at the beginning in that the sheet is clamped by a frame surrounding the solid at a distance and the sheet is held by the frame during pressing with the pressure cushion.
The frame has the effect of tensioning and slightly stretching the sheet. An increased stretching takes place in the region of projections on the outline of the solid, for instance at the four corners of a rectangular board, at which folds occur in the case of the known process. By increased stretching in these regions, excess material is drawn off and at the same time the sheet is adapted to the contour of the solid.
An apparatus according to the invention for the implementation of this pr
REFERENCES:
patent: 1856694 (1932-05-01), DeCorrevont
patent: 2419758 (1947-04-01), Borkland
patent: 3305618 (1967-02-01), Sucher et al.
patent: 3466706 (1969-09-01), Asano
patent: 3546221 (1970-12-01), Johnson
patent: 3566650 (1971-03-01), Johnson
patent: 4249983 (1981-02-01), Fujii
patent: 4252518 (1981-02-01), Kiefer
patent: 4416716 (1983-11-01), Ichikawa et al.
patent: 4447282 (1984-05-01), Valerio et al.
patent: 4692199 (1987-09-01), Kozlowski
patent: 4700474 (1987-10-01), Choinski
patent: 4806195 (1989-02-01), Namysi
Engel, Jr. James J.
Simmons David A.
LandOfFree
Apparatus for the plastics coating of three-dimensional solids does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for the plastics coating of three-dimensional solids, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for the plastics coating of three-dimensional solids will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1687097